mirror of
https://github.com/tianocore/edk2
synced 2026-08-27 00:23:19 -04:00
1fb88ffe28
This commit removes OVMF IA32 from edk2 per RFC https://edk2.groups.io/g/devel/topic/rfc_remove_ovmf_ia32_and/114152215. OVMF IA32 is a 32 bit only platform that no longer represents the vast majority of physical platforms. The RFC details more reasoning in much more depth. OVMF IA32 will be kept in a branch off the edk2-stable202508 tag for any long term consumers; it will receive build break updates only (e.g. if an upstream submodule changes location). Signed-off-by: Oliver Smith-Denny <osde@microsoft.com>
87 lines
2.9 KiB
NASM
87 lines
2.9 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; JumpToKernel (
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; VOID *KernelStart, // rcx
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; VOID *KernelBootParams // rdx
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(JumpToKernel)
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ASM_PFX(JumpToKernel):
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; Set up for executing kernel. BP in %esi, entry point on the stack
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; (64-bit when the 'ret' will use it as 32-bit, but we're little-endian)
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mov rsi, rdx
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push rcx
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; Jump into the compatibility mode CS
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push 0x10
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lea rax, [.0]
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push rax
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DB 0x48, 0xcb ; retfq
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.0:
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; Now in compatibility mode.
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DB 0xb8, 0x18, 0x0, 0x0, 0x0 ; movl $0x18, %eax
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DB 0x8e, 0xd8 ; movl %eax, %ds
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DB 0x8e, 0xc0 ; movl %eax, %es
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DB 0x8e, 0xe0 ; movl %eax, %fs
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DB 0x8e, 0xe8 ; movl %eax, %gs
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DB 0x8e, 0xd0 ; movl %eax, %ss
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; Disable paging
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DB 0xf, 0x20, 0xc0 ; movl %cr0, %eax
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DB 0xf, 0xba, 0xf8, 0x1f ; btcl $31, %eax
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DB 0xf, 0x22, 0xc0 ; movl %eax, %cr0
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; Disable long mode in EFER
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DB 0xb9, 0x80, 0x0, 0x0, 0xc0 ; movl $0x0c0000080, %ecx
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DB 0xf, 0x32 ; rdmsr
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DB 0xf, 0xba, 0xf8, 0x8 ; btcl $8, %eax
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DB 0xf, 0x30 ; wrmsr
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; Disable PAE
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DB 0xf, 0x20, 0xe0 ; movl %cr4, %eax
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DB 0xf, 0xba, 0xf8, 0x5 ; btcl $5, %eax
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DB 0xf, 0x22, 0xe0 ; movl %eax, %cr4
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DB 0x31, 0xed ; xor %ebp, %ebp
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DB 0x31, 0xff ; xor %edi, %edi
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DB 0x31, 0xdb ; xor %ebx, %ebx
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DB 0xc3 ; ret
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; JumpToUefiKernel (
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; EFI_HANDLE ImageHandle, // rcx
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; EFI_SYSTEM_TABLE *SystemTable, // rdx
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; VOID *KernelBootParams // r8
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; VOID *KernelStart, // r9
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(JumpToUefiKernel)
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ASM_PFX(JumpToUefiKernel):
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mov rdi, rcx
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mov rsi, rdx
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mov rdx, r8
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xor rax, rax
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mov eax, [r8 + 0x264]
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add r9, rax
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add r9, 0x200
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call r9
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ret
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